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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f42ab8066693d4145fd510188bf7531a865b1975281324970c0b1faba5c72497' 
  AND token = 'PNE+b+GJpEw19co/8PWXPx2kL04q6yF4KW7vsowjc5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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