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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9c6511825a38b36e7a2299fa326feacc3e3c7a63db56af53edd764c923e9747' 
  AND token = 'e+9P/Q5JZgVdW+6HLHdR65FLtHDElBjiGNrEc+yooPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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