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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a91785446bc5a0719a802afe5fbc0ec52c2bd9d2204268b4251f5a9a0c55081' 
  AND token = 'I31cxO8oyKbXmCpHk9RrSa6men4iHrWwytRwGj1b4DQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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