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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5b7147315fdb07e2babb3ec02386ceeaf0b90b5dfab826858b9fae14fcb5f37' 
  AND token = '56Re3EqQ1pBxae8Uy4HL9XknNxSwtuTMgQ492EeASpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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