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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7f237d5eba91f765f8d91e2840c6f44cc11f3a583810fb64392c0ba75c9075e' 
  AND token = '0ibdjbPAJ/xoHIy29DEgJYMURSpsxRJItfIb15rtxkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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