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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f87697aaa0e0d6dc9f3e6502e32273c9eac9eeba9c8bea4e7c1c5d91ac11ca26' 
  AND token = 'TSwTSRRC60Z0RCkaQcejdeZFIWhu2hj2k7XCrD1tFwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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