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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95de38cacea1e9d17d3cfbcc3110680833276fc4b925a86b5a693977164a3bbe' 
  AND token = 'o/Es2uCasr75LEO/itCCySjJdYa+GaP0Hz4sP+in7/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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