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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f25d1aeb9943ed49abe34955c78a6e50132249f360d6e11daa26ead78d82b19f' 
  AND token = 'TA6a2BGCmHdtMHHoqcqfo3+lQsL9tURATPro+6+nMCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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