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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83d1b2bcaede1b0fa7ed37dab303d575e945fe8039deba4332f29c9d9c92d5a3' 
  AND token = 'iiPP+zGF2OD+iW9JDSRPwjQIdNjsLpBWw/TtXNI23gE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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