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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0566f0fd2fa6fe1a9747961ffd3b9117adc9103dc73c8a6a922b6a8f6271e4c2' 
  AND token = 'KJircr9MUKGd+TBbpdlEsnu5mNipYEMPGTw6D/2Ac9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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