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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a045ab983631b3aef409dd990205a70b0c7e5699a0b8735b2871b940d3b2ce6' 
  AND token = 'FU4PBs8Dk/VuqFYnmsbrrdiuzA3cjEHgVl1j7Y2b+Lc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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