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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b820c88fadc64a0301d8db2ef1e200fc4411458ca0ec06fa990d05a22d3af38a' 
  AND token = '0CyDOK/sCv+Yw7JOCvQ2n7N2jjDoYS7dLWcd04caTAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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