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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31c19f9794c5d3174559f0f5f8d9fbd54eb1eb02bea40734cb7c7e2cb939d391' 
  AND token = '5x8Z1kQ1hjYshhw43gmjELCQqDtILmhbhiDEl3bpmAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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