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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2e23e0ade1fa32d709a6dcf96c088500a2544bfa7c7f5cb8a4cf444ab1e2a47' 
  AND token = 'TC6r4DJv1UaoCUMVHXw4y+Vp+WniSTqltgUrKhqTghs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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