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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ccafeef51209f43d435a0ad6444449d34184a84195a0ba169e051485d3e06b6' 
  AND token = 'Sn1IsakatRl8f3e+zn0BYi2N5sRQBxhHELxMz22vIIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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