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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c9653fcace12518fd07c9163c07103f1975c9e4aa2020b51e208fd2e2c74429' 
  AND token = 'Q5JnXittacoFiotNy4qXs/Roo0vXDbl9iELHvMfggqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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