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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abe7f06203b2ebeb0ce35bb6c07e98f2108b739241b01f8ed3fae6827e72f18d' 
  AND token = 'NCNTa0l0m/wyh+HvGTl3/KZp99sOuL67S01BPiMGmQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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