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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb1ab3f5a797fc45b39857fc1157a777f86acee9e970658c2628b3d8f3d0849e' 
  AND token = 'JKLSrNL4LI6IkImGFhyLCNQvbtynr62o/vsnMPrG/Ec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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