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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70a5507e120d6930003defc1d3caa8c62edc06dc0c16a0c02c471b13fb0e428a' 
  AND token = 'teFc4LtEKWAoeqC2XVPdB+nW+9L1VRO0PeQdTmLNNbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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