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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1d4ab4d823bead7954ab4481fec05e33ce92660c7f434a8077ad37aeab4a0c9' 
  AND token = 'RKZptYlkm8NnfU3g/PYu/P06DGqOVGPbbDoIpiWzc4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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