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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '020e91ac22f0077cc15ba4de3f2082f9c520806c0034840f709cc1b2a380dadc' 
  AND token = '18Qbx/ry6oWKGx8lI24sWxkBh8rcg/ORzhAGIpfeqoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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