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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '570e63cbcb5c2f0b47d68503bd52ff2a31b052a7067d3255d8ec9dbc472a2e66' 
  AND token = 'td6jZ/KxJXr4piejI2zAjweRfx7lSaHEBXVFSXjRKkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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