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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54740c9a433671394743e5eaec3d10664c2d0d5e865205afb4a4ce9d662de1f5' 
  AND token = 'V2lYPdtulf3yEXmLnvN8mO+VUdPK7CTfqjHbgrXvBPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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