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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7120f4a510ffc0dc4c63239811496527617214a6720a0928d72efd7b3494cab' 
  AND token = 'mi/fORdp2s+fIQ8nGhk/EWp8LJATIinU2aUomVHKSL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00084

JSON explain

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