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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0840e04fcb840ecfac2e4859dc11873f4d7083c1c6e9e69831c49867d9d4b4ff' 
  AND token = 'Km38OlyOBiXkA+fY+Uug54J4dsDRQKokqq/uOlBe05U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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