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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25e8880cade67cbf26284a007db6de27ccbf31a7252110656830bcce0a7e1a11' 
  AND token = '5H+XFeiAa952klG42eyK+gE57g5CZLS3fQTjisSB2fk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}