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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0ded8e77378e2b36698ac1c587980faeffd2c27b3b9ea8e49254a463fe4b20e' 
  AND token = 'G2Jg+nf1sfUJ7tj7r2xvWg/RFj89O/GzKNKfUpYdfMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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