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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59f2c7f96c16ad7d24cf606983f86bd38fd19e3ccf8dbda62ac6e7528cfe036b' 
  AND token = 'CgTLm8f358DApDRof2Q01jVR8oOMmNrfo/1Os6e+F20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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