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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b3e6b0286accb184f8360b28d7df34c5f8178a8f3b06323f972396632aa5405' 
  AND token = 'SbzJ4VpMrGvIO2Yqgroz9k1PFG6HaeD7f73JomZ7wdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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