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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a00a69b14b24268ff39d836ee045c394ff2ebbed401a0b161b993cc3789d2031' 
  AND token = '4DGrDbbstmd7R96zYJIPCfkddTxZKYCdb70cL4ndLjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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