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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06c2b2f9e0b48b34cd510c22dea93981f3a257201564caaa40b2400a6adbd711' 
  AND token = 'rIFdzBNZUB+gb1tipaHbF0HjWtWnOpJ6IIEIH+4j6WM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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