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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ead2990d9a0974024a4b4c459592bb4e52694debaa0b1d95859a91a6b72c6e3' 
  AND token = 'on7kDTD6EU5V85gRZohlXL9ZcjgWrsDLnzVtm9IA27M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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