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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b11d9a1c06a7c6e2a1d77c575b997de227fa2aa25df88d5d825975baa5310d9' 
  AND token = 'nAhNIzqt/Uj3ixfU56YP0X/11Qx7nu76z1neO9cl7RY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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