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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6c0ff1ee643a205a5b60920802b7cdcc3ef73994b9eb409754963cc382152cd' 
  AND token = 'BeEdbBMCa+FdJ+R1ukeJ6ZS8tUnFRdh82ZgczOmVROs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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