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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a40c12b6337b286c8fa43b68c4db6312392cf333572c1f468293b1672b441c46' 
  AND token = 'xnrP2k1ir9vmmGR44qLq4Auh5Q6NMdHlz61sUALXtVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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