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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fca50c6a437509712a5de9f11d81af6f59aec046509dab4b5b850d0133f0471a' 
  AND token = '+5uzKplVWZO5i0KBEfM4fRbAxcbmm7MmH6OpD9cgBF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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