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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68ca7916ef5a7a27363fd06eb4c5643b213a222624fc0e745d3eaa777d1a871c' 
  AND token = 'jQkhYv00mSC+SVZkZ/6m1ds7IY4v8kBA720Q6KIwQGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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