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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd308392db7637758d4e363f289320ad0b5dcd96c6a9dbeabe340cceb70ea893e' 
  AND token = 'pPGg38ejZWmnqqay9vLPBA9ggG2SY/Wu4F+WFKTNoK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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