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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1b2be82b0a2b1f085e73a38e91c68295eb03cdb663ea700a80785b0a6adf1d2' 
  AND token = 'e7NH0x6m0VYbIXUL0wiFYEHAfm6Ppe+gfFG99xtNL1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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