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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbbefe4eafe31582f2607e08e142781e4c8fbc6dab5c86d077164e4297b51510' 
  AND token = 'FDnAlOY4G70zguQAztUYdceM8MPVATyr0kdZjxXy51I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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