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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0002d3eed554c7ad94d32232e5185779bce8749788551fe28deef49c7f79c04' 
  AND token = 'rwLkZwgjg2oVkZ9/XShrqoOumK7Ka8yS+4rzt1p5yec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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