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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e31020a615b3bd64a944851b152b2f75e05af2021fbb5bc8f31cede105e7725a' 
  AND token = '7R2peg9oxFLgoIE+d65SFYxmZ/62z0dW4t/lAhOG5ZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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