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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9357afbe0a3feac77f1b533e251e55b66af22c8a5e9a462aa396deb9251213d7' 
  AND token = 'x/d5LzjuyqfoF6XhLEbdPiMZb6G4734XGgJIR2H3aAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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