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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50c796d3925a1a73e92269a0f0b1ccbe50987b2dc2ef4fcbd20e00d807ab383e' 
  AND token = 'FY5MT602I96jVmxqFiaPjQ2hIXF89U+CZz7Zjxunvec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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